Re: Choosing caliber for suppressed pistol
On the Wow factor it's probably a toss up. The .45 is pretty cool because it is a larger bullet, but the 9mm cans are more efficient dry.
I would say 9mm probably has more utility given nearly no need for wet charges on the best in class cans like the Octane 9 and Tirant 9.
The .45ACP side of the house is a wet can game, and they do well wet, of course wet is a little less convenient (recharging every 10-20 rounds).
Some people do 40caliber or .45 cans with other pistons for the 9mm. This will cause some reduction in sound performance, but will give you greater safety from strikes as well as the capability for the greater caliber.
These super high performance cans have tighter bores than ever before often with some apertures .035" or less over bullet diameter, so that may be a reasonable concern.
Liberty suppressors showed a Sig factory barrel with ~.06" of total included runout on their youtube channel. That's the kind of consideration that makes that case.
